Pump



Jan. 19, 1943. F. E. SMITH" f 2,308,837

PUMP l Filed April 28, 1941 w :5::1. "-2. Immun A s.: asm; ma WA gmx: .s

EVS/wmf, I N VEN TOR;

. z ATTORNEY Patented Jan. 19, 1943 naires stares PATENT orrlca PUMP Frederick E. Smith, Santa Paula, Calif.

Application April 28, 1941, Serial No. 390,652

2 Claims. (Cl. 128-297) This invention relates to pumps.

[in object of the invention is the provision of a novel form of pump which may be readily carried and be instantly serviceable for the removal of venom from a wound occasioned by snake bite or the sting of poisonous insects, such as spiders. vIt is ordinary practice, in case of snake bite, to immediately make an incision and allow the blood to iiovv and drain the poison from the Wound.

if a snake bite occurs in certain parts of the body, great diiculty is encountered if the wound is not readily accessible, such as on the back. Under such circumstances, suction cannot be applied to the wound by the mouth, and if the person who has the bite is alone, death may follow. The present invention contemplates a pump which may be readily applied to any portion of the body and exercise a powerful negative pressure upon the wound to remove the poisons therefrom. The device is so constituted that it may be locked inany position to constantly maintain a negative Apressure and assure that all poison is removed and received within the said device. To assist the device, it is 01'-,- dinary practice to cut the Wound so that the poison is more readily removed.

An object of the invention is the provision of a pump of novel construction, positive in operation, readily useful, and generally superior to devices now known to the inventor for performing the function intended therefor.

With the above mentioned objects in view, the invention consists in the novel and usefulprovision, formation, construction, association, and relative arrangement of parts, members and features, all as shown in certain embodiments in the accompanying drawing, described generally, and more particularly pointed out in the claims.

In the drawing:

Figure l is an elevation of one form of the invention,

Figure 2 is a sectional view on the line 2-2 of Figure 1 and on an enlarged scale from said figure,

Figure 3 is a sectional vieW on the line 3-3 of Figure 2,

Figure 4 is a modified form of the invention, and,

Figure 5 is a sectional view on the line 5-5 of Figure 4.

Referring now to the construction of the improved pump shown in Figures 1 to 3, the same includes a cylinder I which is diametrically slotted for a portion thereof, as shown at 2 and 3, with the slotted portion thereof externally screw-threaded at one end, as shown at to receive an internally threaded cap 5. The opposite end of the cylinder may be provided with an external ring 6 for the purpose of enhancing the appearance of the device, and likewise giving a larger surface contact with an object. Within the cylinder is a plunger designated generally as l. This plunger includes a cup-type washer 8, the sides of which engage the inner surface of the cylinder, the cup-type washer embracing a cap 9 flanged at I0 to aid in guiding movement of the plunger within the cylinder. The cap and washer are held in working relationship by a nut and screw arrangement II and I2. The cap 9 surrounds in part a plunger tube I3. Within the plunger tube is a coil spring Id. One end of the spring bears against a surface of the cap 9, and the opposite end against a disk I 5 receivable within the confines of the plunger 2. A strut or rod I6 extends between the disk I5 and a disk Il, which is held against the slotted end of the cylinder through the medium of the cap 5. The end I8 of the plunger tube I3'is provided with a pair of diametrically extended arms I9 and 20. These arms extend through the slots 2 and 3 and outwardly beyond the confines of the cylinder.

Loosely surrounding the cylinder I is a ring 2i provided with a pair of diametrically disposed wings 22 and 23, termed nger bars. Secured between the wings or finger bars and the arms I9 and 20 are struts or rods 24 and 25. Thus,

movement of the ring 2| relative to the cylinder will produce movement of the plunger tube and plunger within the cylinder. This movement is not free, however, being opposed by spring It, it being noted that the disk I5 is iixed against movement so that as the plunger tube moves upwardly to raise the plunger Within the cylinder, the spring I4 is compressed between said disk I5 and the inner surface of the cap 9. Thus, the plunger and its tube are normally urged toward the entrance to said cylinder which is adjacent 0 the ring 6.

It has been found feasible and advantageous to provide some medium whereby the plunger may be locked or held in a xed position within the said cylinder. To accomplish this, I have provided, in one embodiment of my invention, a simple clutch which automatically releases to permit the plunger to move upwardly within the cylinder, and upon releasing the finger bars, to immediately hold the plunger at a dened position Within the cylinder. In this manner, a constant negative pressure is exerted upon an object when the ring end of the cylinder is in engagement with the object.

The clutch device includes a disk 26 provided with an enlarged opening 21, through which opening the rod I6 is passed. The disk 26 has an arm 28 extending laterally therefrom, then bent substantially at right angles to the lateral portion, as shown at 29, the end of the arm terminating in aclip .30, the clip comprising twoshort arms adapted to embrace sides of one of the struts or rods, in the present instance the one at 25. Thus, when the palm of the hand engages the end of the cap and the lingers grip beneath the linger bars 22 and 23, pressure between the fingers and the palm of the `hand will move the plunger and plunger tube upwardly within the cylinder, the rod I6 readily passing through the enlarged opening 21 of thedisk 26.

However, when the pressure between the palm of the hand and lthe iingers is released `from engagement with the linger bars, andthe plunger and plunger tube commence retrograde `movement under force of the vspring `I-'4, the disk 26, particularly .the -vwall ,bounding the opening, will engage the rod I6 andstop downward movement of the plunger. To release the plunger .and plunger tube, the larm portion 29 may be engagedby the lingers to swing the same outwardly, as indicated in the-fulllline position of Figure 2. The gripping Vposition is that illustrated lby the dotted lines in'thisgure.

The form of :the invention illustrated in Figures l andldoesnot differ in any principal particulars from that shown Ain `Figures 1 to 3,

with the exception of the character of thelocking device `for the yplunger andvtube In this instance, the cylinder adjacent .the slots 2 and 3 is formed with a series of teeth 3l and'32. Thus, to lock the1plunger in any selected position within the; cylinder, the Aiinger :bars are rotatedslightly to .permit the arms I9 and 20 to enter between selected teeth.

The operation of the device is undoubtedly understood `from the description given. However, in actual practice, and considering its use tfor snake bite, ithas been deemed advisable to use a knife of some form to make an incision at lthe wound and apply the end vof the pump over the wound. The plunger is then moved upwardly within thecylinder to exert a negative `pressure upon .the wound and attempt to remove the venom and `prevent it from reaching the lymph channels. Instead of vrapidly or slowly operating the plunger within the cylinder, it maybe found-advisable, in certain instances, to lock-the plunger "at a certain defined position within the cylinder so that Va constant suction is applied over'the'woun'd.

The device has beeniound extremely compact and useful in actual practice. The device is readily cleaned and sterilization does not aiect the parts. All parts may be disassembled and readily reassembled. There is nothing to get out of order, and the device will stand rough usage.

In an embodiment of the invention, the same is constructed entirely of metal, heavily chromium plated to resist rust and prevent any deterioration by exposure to the elements.

It is quite Lapparent that the device may be used by either hand.

I claim:

1. A venom extractor of the suction type comprising a cylinder having closed and open ends -with the closed end adapted toiit into the palm of the -hand ofthe user, a hollow spring containing plunger in the cylinder, a stationary strut l `in alinement therewith over which the plunger is `movable to compress the spring, vsaid cylinder being axially slotted parallel with the strut, nger operated lmeans lto' retract the plunger against spring :tension including `transverse bars engagea'ble "by :the userfs lngers, rods yparallel with the cylinder- `and `cross pieces extending through theslots and engagedwiththe plunger, -and an angular clutch lcarried 4by said means having one vleg -extendingethrough Aone of said slots and having -an opening Y closely surrounding the` strut with the other leg lying 4adjacent one of the rods and accessible to the iingers for clutch release whereby the jplunger maybe automatically flocked lin its -furtherestfretracted 4position -tomaintain aconstant suctionand manu allylreleased when desired. Y g 2. Alvenomextractor of the suction type comprising 'a cylinder Vhaving closed :and 'open -ends with the closed endladaptedtofit into the palm ofthe hand ofthe user; a hollow'V spring `containing plunger in thercylinder, a stationary Vstrut in alinement therewith over which `Athe lplunger is lmovable to compress the spring,said cylinder being axially slotted parallel -with the strut, iinger-operated means Atoretract the-plunger against spring tension includingtransverse bars engageable lby fthe users lingers, vrods parallel with the cylinder and ycross rpiecesextending through the slots and engaged 4with the gpllunger,v an rangular clutch-carried by said means having one `legfextending `th-rough lone of said -slots and having 4an opening closely `:surrounding the strut with the otherleg lying adjacent -one of the rods and accessible to the fingersforclutchrelease-whereby `the plunger lmay 'be automatically locked in its furtherest retracted position to-maintain a constant suction and -manually released j when desired and `a clip -on i the 4last mentioned leg of the-clutch'to embrace thesides lofthe strut. Y

FREDERICK E. SMITI-I. 

